Fauna Logs provide insights into database performance, behavior, and usage, enabling developers to identify slow-performing queries and bottlenecks, debug application issues, and optimize for cost and performance. The feature allows users to access logs through the Fauna Dashboard or by using a command-line interface, which can be used to export query logs in various formats, including JSONL files or directly into third-party tools like Logstash or Kibana. By analyzing query logs, developers can gain a deep understanding of their application's most frequently used features and identify areas for improvement, ultimately helping to optimize Fauna cost and improve overall system performance.